Bible Dictionaries
Sphaeridium

Webster's Dictionary

(n.) A peculiar sense organ found upon the exterior of most kinds of sea urchins, and consisting of an oval or sherical head surmounting a short pedicel. It is generally supposed to be an olfactory organ.

Bibliography Information
Webster, Noah. Entry for 'Sphaeridium'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​s/sphaeridium.html. 1828.